/******************************************************
SQL evaluator: evaluates simple data structures, like expressions, in
a query graph

(c) 1997 Innobase Oy

Created 12/29/1997 Heikki Tuuri
*******************************************************/

#ifndef eval0eval_h
#define eval0eval_h

#include "univ.i"
#include "que0types.h"
#include "pars0sym.h"
#include "pars0pars.h"

/*********************************************************************
Free the buffer from global dynamic memory for a value of a que_node,
if it has been allocated in the above function. The freeing for pushed
column values is done in sel_col_prefetch_buf_free. */

void eval_node_free_val_buf(
    /*===================*/
    que_node_t *node); /* in: query graph node */
/*********************************************************************
Evaluates a symbol table symbol. */
UNIV_INLINE
void eval_sym(
    /*=====*/
    sym_node_t *sym_node); /* in: symbol table node */
/*********************************************************************
Evaluates an expression. */
UNIV_INLINE
void eval_exp(
    /*=====*/
    que_node_t *exp_node); /* in: expression */
/*********************************************************************
Sets an integer value as the value of an expression node. */
UNIV_INLINE
void eval_node_set_int_val(
    /*==================*/
    que_node_t *node, /* in: expression node */
    lint val);        /* in: value to set */
/*********************************************************************
Gets an integer value from an expression node. */
UNIV_INLINE
lint eval_node_get_int_val(
    /*==================*/
    /* out: integer value */
    que_node_t *node); /* in: expression node */
/*********************************************************************
Copies a binary string value as the value of a query graph node. Allocates a
new buffer if necessary. */
UNIV_INLINE
void eval_node_copy_and_alloc_val(
    /*=========================*/
    que_node_t *node, /* in: query graph node */
    byte *str,        /* in: binary string */
    ulint len);       /* in: string length or UNIV_SQL_NULL */
/*********************************************************************
Copies a query node value to another node. */
UNIV_INLINE
void eval_node_copy_val(
    /*===============*/
    que_node_t *node1,  /* in: node to copy to */
    que_node_t *node2); /* in: node to copy from */
/*********************************************************************
Gets a iboolean value from a query node. */
UNIV_INLINE
ibool eval_node_get_ibool_val(
    /*===================*/
    /* out: iboolean value */
    que_node_t *node); /* in: query graph node */
/*********************************************************************
Evaluates a comparison node. */

ibool eval_cmp(
    /*=====*/
    /* out: the result of the comparison */
    func_node_t *cmp_node); /* in: comparison node */

#ifndef UNIV_NONINL
#include "eval0eval.ic"
#endif

#endif
